Since the late 1990s, the PokÃmon franchise of games, books, comics, cartoons, movies and other merchandise brings in 2.1 billion a year in revenue. An integral part of the franchise's success for the past 20 years has been the PokÃmon Trading Card Game, beginning with the Base Set, then new sets every year, with 71 expansion sets and counting and over 8,000 different cards. This collectors guide will focus on the cards included in these 71 expansion sets, which are the most valuable and rare and the most popular with collectors.